From 3e2439bd1592897ad9f403700cb91ccfd1972779 Mon Sep 17 00:00:00 2001
From: Tim Keller <tjkeller.xyz>
Date: Sun, 13 Apr 2025 14:04:57 -0500
Subject: fix backlight control

---
 modules/root/default.nix    | 1 +
 modules/root/normaluser.nix | 7 ++++++-
 modules/root/udev.nix       | 5 +++++
 3 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 modules/root/udev.nix

diff --git a/modules/root/default.nix b/modules/root/default.nix
index 5397ec4..e24e4b0 100644
--- a/modules/root/default.nix
+++ b/modules/root/default.nix
@@ -19,6 +19,7 @@
 		./ssh.nix
 		./suspend.nix
 		./tlp.nix
+		./udev.nix
 		./wifi.nix
 		./x11.nix
 		./zsh.nix
diff --git a/modules/root/normaluser.nix b/modules/root/normaluser.nix
index fc243ea..b4be0cc 100644
--- a/modules/root/normaluser.nix
+++ b/modules/root/normaluser.nix
@@ -7,6 +7,11 @@
 		#home = userDetails.home.root;
 		isNormalUser = true;
 		hashedPasswordFile = config.sops.secrets.hashed-root-password.path;
-		extraGroups = [ "wheel" "nixbld" ];
+		extraGroups = [
+			"i2c"
+			"nixbld"
+			"video"
+			"wheel"
+		];
 	};
 }
diff --git a/modules/root/udev.nix b/modules/root/udev.nix
new file mode 100644
index 0000000..17ed204
--- /dev/null
+++ b/modules/root/udev.nix
@@ -0,0 +1,5 @@
+{ pkgs, ... }: {
+	services.udev.extraRules = ''
+		SUBSYSTEM=="backlight", ACTION=="add", RUN+="${pkgs.coreutils}/bin/chgrp video /sys/class/backlight/%k/brightness", RUN+="${pkgs.coreutils}/bin/chmod g+w /sys/class/backlight/%k/brightness"
+	'';
+}
-- 
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